Fuel System

Question 1

Where pylons can be installed?

Answer 1

2, 5

Question 2

The booster pump is housed in

Answer 2

The flight sump

Question 3

The flight sump contains fuel for

Answer 3

20 to 23 sec neg g at max throttle

Question 4

FUEL SHUT-OFF VALVE is powered by

Answer 4

Essential bus

Question 5

How long does it take to dump fuel?

Answer 5

2 min for 3/4
6 min for 1/4

Question 6

Fuel dump allows to dump fuel contained in

Answer 6

Tip tanks

Question 7

FUEL DUMP system is alimented by

Answer 7

Essential bus

Question 8

Fuel qty is collected by sensors in the tanks and is sent to

Answer 8

EDAB for showing on MFDs

Question 9

When fuel qty goes below the selected bingo, what happens in the cockpit?

Answer 9

Fuel warning audio message
MASTER CAUTION light
In SYS format, the fuel is displayed in amber background

Question 10

F. TRANS turns on when

Answer 10

When fuel transfer rate is below normal values
Fuel qty in fuselage tank is 500 +30/-20kg, w/ at least 45kg in tip tanks

Question 11

F. LOW turns on when

Answer 11

Fuselage tank below 210+-20kg (F34)

Question 12

Fuel used for 339CD is

Answer 12

NATO F-34 (JP-8)

Question 13

F. UNBAL turns on when

Answer 13

60kg for 12 sec

Question 14

The error in fuel measurement from sensors is

Answer 14

+-15kg and 2% of the indication

Question 15

The unusable fuel in tip tanks is

Answer 15

10kg

Question 16

Minimum fuel qty in each tip tank is

Answer 16

10kg (they are considered empty)

Question 17

Nominal density F-34

Answer 17

0.803 kg/dm3

Question 18

Name of the Air refueling nozzle

Answer 18

MA-2 standard

Question 19

How many inlet valves are there in the fuel system?

Answer 19

3

Question 20

How many vent/safety valves are there?

Answer 20

1

Question 21

How valves are open/close during air to air refueling?

Answer 21

By pushing the AR/ON/FAIL push button they are open
They close automatically as the selected qty of fuel is reached or if the air refueling switch is put back to off

Question 22

When does the probe nozzle valve open?

Answer 22

At the contact w/ basket, allowing fuel to flow

Question 23

FAIL light in refueling system comes on when

Answer 23

1 of the 3 Inlet valves, or the vent/safety valve stay closed instead of opening

Question 24

During air to air refuel operation, how do we understand that the selected qty has been reached?

Answer 24

ON light goes off (inlet valves and vent safety valve automatically close)

Question 25

F.VENT comes on when

Answer 25

Fuel vent/safety valve fails to close when the operation is over

Question 26

If after air refueling ON light stays on it means that

Answer 26

1 of the 3 inlet valves failed to close

Question 27

What switch does activate Booster pump?

Answer 27

ENG/MSTR moved to ON

Question 28

At what qty in the fuselage tank transfer valves open sending fuel to it from tips/pylons?

Answer 28

590kg

Question 29

When tips are empty, how does the system maintain positive pressure in the fuselage tank?

Answer 29

W/ pressurized air flowing from empty tips to fuselage

Question 30

Name the caution lights of the fuel system

Answer 30

F. UNBAL F. LOW F. VENT F. PRSS F. TRANS

Question 31

When caution legend of fuel system comes on an audio “FUEL WARNING” is heard in the headset, except for what light?

Answer 31

F. VENT

Question 32

Inverted Flight Sump capacity

Answer 32

14 l

Question 33

Booster pump sends fuel to the engine feeding system at a pressure of

Answer 33

18psi

Question 34

What is the pressure of the air used to cause fuel transfer?

Answer 34

4.5psi

Question 35

In what case moving the FUEL TRANSFER SWITCH from pyl to tip does not produce any effect?

Answer 35

In case of batteries failure, or selecting BAT SWITCH to EMERG

Question 36

Unusable fuel in fuselage tank

Answer 36

NIL

Question 37

Once F. PRSS illuminates

Answer 37

It means that Booster pump is not working properly, therefore the engine driven pump ensures functionality of the engine for only 15’ at max power

Question 38

Single point refueling pressure range

Answer 38

30-50psi

Question 39

Fuselage tank qty

Answer 39

626kg

Question 40

Wing tip tanks qty

Answer 40

803kg

Question 41

Pylons qty

Answer 41

530kg

Question 42

Max amount of fuel without pylons

Answer 42

1429kg

Question 43

Max amount of fuel with pylons

Answer 43

1959kg

Question 44

Fuel from the booster pump, before reaching the supply system flows into

Answer 44

Anular filter

Question 45

When pylons are empty, what other light comes on warning us to move the transfer switch?

Answer 45

MASTER CAUTION

Question 46

The fuel measuring system in the pylons

Answer 46

Doesn’t provide w/ qty but only if empty

Question 47

When fuel is below bingo, fuel qty will appear

Answer 47

In amber background

Question 48

Considerations when F. VENT comes on

Answer 48

Do not do aggressive maneuvers Fuel transfer from the tips might not be working properly (considerations about a reduced range)

Question 49

During refueling the fuel flows

Answer 49

From the fuselage tank to the tip tanks

Question 50

For operating the refuel system on ground

Answer 50

Battery must be on

Question 51

Green lights (2) in the Fuel Control Panel indicate that

Answer 51

The fuselage inlet valve and safety/ vent valve are open and Fuel Transfer valves are open

Question 52

How can be understood from the Fuel Control Panel when we reached the desired qty of fuel in that tank?

Answer 52

Because the respective red light on the panel goes out

Question 53

What does the Fuel Control Box do?

Answer 53

Used mainly for refueling ops. Receives inputs from: - A/R switch - Refueling Control Panel -AR/ON/FAIL push button for opening and closing of 3 inlet valves and vent/safety valve Communicates with EDAB

Question 54

In the fuel system, pressure coming from air bled in the 8th stage of the compressor, is reduced to 4.5psi from

Answer 54

Pressure Reducing Valve

Question 55

During A/A refueling, after how many kg above bingo the amber background caused by BINGO fuel will go out?

Answer 55

50kg

Question 56

At what pressure F. PRSS comes on?

Answer 56

When fuel pressure produced by the booster pump is 3psi or less

Question 57

What is the max fuel unbalance in the tips that produces 850kgm and 1100kgm reported in the ops limits?

Answer 57

850kgm -> 160kg unbalance tips 1100kgm -> 210kg unbalance tips

Question 58

What is the normal fuel transfer rate?

Answer 58

41kg/min